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Contracts for inventory purchase commitment (Details)
 12 Months Ended
Dec. 31, 2020
Concentrate  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2020 ~ 2030
Contracted amounts 32,435 Ton U3O8
Transformed  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2020 ~ 2030
Contracted amounts 18,088 Ton U
Enrichment  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2030
Contracted amounts 17,667 Ton SWU